/* Modern SaaS Design System */
:root {
    /* Color Palette */
    --primary: #4F46E5;       /* Indigo 600 */
    --primary-hover: #4338CA; /* Indigo 700 */
    --primary-light: #EEF2FF; /* Indigo 50 */
    
    --secondary: #64748B;     /* Slate 500 */
    --secondary-hover: #475569; /* Slate 600 */
    
    --success: #10B981;       /* Emerald 500 */
    --danger: #EF4444;        /* Red 500 */
    --warning: #F59E0B;       /* Amber 500 */
    
    --bg-body: #F3F4F6;       /* Gray 100 */
    --bg-surface: #FFFFFF;    /* White */
    --bg-sidebar: #1F2937;    /* Gray 900 */
    
    --text-main: #111827;     /* Gray 900 */
    --text-muted: #6B7280;    /* Gray 500 */
    --text-light: #F9FAFB;    /* Gray 50 */
    
    --border: #E5E7EB;        /* Gray 200 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius: 0.5rem;
    --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.2s;
}

ul {
    list-style: none;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background-color: var(--bg-sidebar);
    color: var(--text-light);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

@media (max-width: 768px) {
    .sidebar.mobile-overlay {
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        z-index: 100;
        width: 260px;
        box-shadow: 0 0 15px rgba(0,0,0,0.5);
    }
}

.sidebar-header {
    height: 64px;
    display: flex;
    align-items: center;
    padding: 0 1.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
}

.sidebar-nav {
    flex: 1;
    padding: 1.5rem 1rem;
    overflow-y: auto;
}

.nav-item {
    display: block;
    padding: 0.75rem 1rem;
    margin-bottom: 0.5rem;
    border-radius: var(--radius);
    color: #D1D5DB; /* Gray 300 */
    font-weight: 500;
    transition: all 0.2s;
}

.nav-item:hover, .nav-item.active {
    background-color: rgba(255,255,255,0.1);
    color: white;
}

.nav-section-title {
    text-transform: uppercase;
    font-size: 0.75rem;
    font-weight: 700;
    color: #9CA3AF;
    margin: 1.5rem 0 0.5rem 1rem;
    letter-spacing: 0.05em;
}

.sidebar-footer {
    padding: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 32px;
    height: 32px;
    background-color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
}

.user-info {
    flex: 1;
    min-width: 0;
}

.user-name {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-role {
    display: block;
    font-size: 0.75rem;
    color: #9CA3AF;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

.topbar {
    height: 64px;
    background-color: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
}

.content-wrapper {
    padding: 2rem;
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
}

/* Components */
.card {
    background-color: var(--bg-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border);
}

.card h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-main);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
    border: 1px solid transparent;
    gap: 0.5rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}
.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: white;
    border-color: var(--border);
    color: var(--text-main);
}
.btn-secondary:hover {
    background-color: var(--bg-body);
}

.btn-danger {
    background-color: var(--danger);
    color: white;
}
.btn-danger:hover {
    opacity: 0.9;
}

.btn-success {
    background-color: var(--success);
    color: white;
}
.btn-success:hover {
    opacity: 0.9;
}

.btn-outline-danger {
    background-color: transparent;
    border-color: var(--danger);
    color: var(--danger);
}
.btn-outline-danger:hover {
    background-color: var(--danger);
    color: white;
}

.btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
}

.btn-xs {
    padding: 0.125rem 0.375rem;
    font-size: 0.7rem;
    line-height: 1;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.625rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.875rem;
    background-color: var(--bg-surface);
    transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
    width: 100%;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

th {
    text-align: left;
    padding: 0.75rem 1rem;
    background-color: var(--bg-body);
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

td {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border);
    color: var(--text-main);
}

tr:last-child td {
    border-bottom: none;
}

/* Login Page Specifics */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--bg-body);
}

.login-card {
    background: var(--bg-surface);
    padding: 2.5rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-header {
    margin-bottom: 2rem;
}

.login-header h2 {
    color: var(--text-main);
    font-size: 1.5rem;
    font-weight: 700;
}

.login-header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* Utilities */
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-lg { font-size: 1.125rem; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--text-muted); }
.text-primary { color: var(--primary); }
.text-white { color: white; }
.text-red-600 { color: #DC2626; }
.text-red-700 { color: #B91C1C; }
.text-red-800 { color: #991B1B; }
.text-green-600 { color: #059669; }
.text-yellow-600 { color: #D97706; }
.text-yellow-700 { color: #B45309; }
.text-yellow-800 { color: #92400E; }
.text-gray-500 { color: #6B7280; }
.text-gray-600 { color: #4B5563; }
.text-gray-700 { color: #374151; }
.text-gray-800 { color: #1F2937; }
.text-gray-900 { color: #111827; }
.text-xl { font-size: 1.25rem; line-height: 1.75rem; }
.text-2xl { font-size: 1.5rem; line-height: 2rem; }

.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-medium { font-weight: 500; }
.uppercase { text-transform: uppercase; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mt-8 { margin-top: 2rem; }
.ml-2 { margin-left: 0.5rem; }
.mr-2 { margin-right: 0.5rem; }
.mx-4 { margin-left: 1rem; margin-right: 1rem; }
.p-0 { padding: 0; }
.p-1 { padding: 0.25rem; }
.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-5 { padding: 1.25rem; }
.p-6 { padding: 1.5rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.pt-4 { padding-top: 1rem; }

.border { border: 1px solid var(--border); }
.border-t { border-top: 1px solid var(--border); }
.border-b { border-bottom: 1px solid var(--border); }
.border-red-200 { border-color: #FECACA; }
.border-yellow-200 { border-color: #FDE68A; }
.rounded { border-radius: var(--radius); }
.rounded-lg { border-radius: 0.5rem; }
.rounded-xl { border-radius: 0.75rem; }
.rounded-full { border-radius: 9999px; }

.bg-white { background-color: white; }
.bg-gray-50 { background-color: #F9FAFB; }
.bg-blue-50 { background-color: #EFF6FF; }
.bg-green-50 { background-color: #ECFDF5; }
.bg-yellow-50 { background-color: #FFFBEB; }
.bg-purple-50 { background-color: #F5F3FF; }
.bg-red-50 { background-color: #FEF2F2; }
.bg-primary { background-color: var(--primary); }

.border-primary { border-color: var(--primary); }
.shadow-lg { box-shadow: var(--shadow-lg); }

.w-full { width: 100%; }
.max-w-md { max-width: 28rem; }
.max-w-lg { max-width: 32rem; }
.h-full { height: 100%; }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.justify-between { justify-content: space-between; }
.justify-end { justify-content: flex-end; }
.justify-center { justify-content: center; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }

.grid { display: grid; }
.grid-cols-1 { grid-template-columns: repeat(1, minmax(0, 1fr)); }
.grid-cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-cols-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }
.grid-cols-6 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
@media (max-width: 768px) {
    .grid-cols-2, .grid-cols-3, .grid-cols-4, .grid-cols-5, .grid-cols-6 { grid-template-columns: 1fr; }
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
}
.alert-error { background-color: #FEF2F2; color: #991B1B; }
.alert-success { background-color: #ECFDF5; color: #065F46; }

/* Status Badges */
.badge {
    display: inline-flex;
    padding: 0.25rem 0.5rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    align-items: center;
    gap: 0.25rem;
}
.badge-success { background-color: #D1FAE5; color: #065F46; }
.badge-warning { background-color: #FEF3C7; color: #92400E; }
.badge-danger { background-color: #FEE2E2; color: #991B1B; }
.badge-secondary { background-color: #F3F4F6; color: #374151; }

/* Modal System */
.modal-backdrop {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 50;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    backdrop-filter: blur(2px);
}

.modal-backdrop.active {
    display: flex;
}

.modal-panel {
    background-color: white;
    border-radius: 0.75rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    width: 100%;
    max-width: 32rem;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(0.95);
    opacity: 0;
    transition: all 0.2s ease-out;
}

.modal-backdrop.active .modal-panel {
    transform: scale(1);
    opacity: 1;
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #FAFAFA;
}

.modal-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-main);
}

.modal-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 0.125rem;
}

.modal-close {
    color: var(--text-muted);
    padding: 0.5rem;
    border-radius: 9999px;
    cursor: pointer;
    transition: all 0.2s;
    background: transparent;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background-color: rgba(0,0,0,0.05);
    color: var(--text-main);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
    flex: 1;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    background-color: #FAFAFA;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Helper for hidden elements */
.hidden { display: none; }

/* Border Utilities */
.border-l-4 { border-left-width: 4px; }
.border-l-indigo-500 { border-left-color: #6366f1; }
.border-l-primary { border-left-color: var(--primary); }
.line-clamp-3 {
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.hover\:shadow-lg:hover { box-shadow: var(--shadow-lg); }
.transition-shadow { transition-property: box-shadow; transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1); transition-duration: 150ms; }
.duration-200 { transition-duration: 200ms; }